"With a literature much vaster than those of
algebra and arithmetic
combined, and at least as extensive as that of
analysis, geometry is a
richer treasure house of more
interesting and half-forgotten things, which a hurried generation has no
leisure to enjoy, than any other division of mathematics."Coxeter and Greitzer 1967, Geometry
Revisited, p. 1.

"The cowboys have a way of trussing up a
steer or a pugnacious bronco which fixes the brute so that it can
neither move nor think. This is the hog-tie, and it is what Euclid did to
geometry."The Search For Truth.

"Euclid
taught me that without assumptions
there is no proof. Therefore, in any
argument,
examine the assumptions."In H. Eves Return to Mathematical Circles., Boston: Prindle, Weber and
Schmidt, 1988.